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The table below shows the years in which the numbers could relate. The most sustainable numbering system Gibson was launched in 1977, an eight-digit number.The first and fifth digit representing the year of manufacture.
(After 5 9999 came 510 000) Evidently the production was high in 1956 because "6 9999" is exceeded.
If the stamped number consists 5 digits, there is a space between the first and second digit (a separation between the last digit of the year and the actual serial number).